Officials have not made any connection between the threats and the shooting.

The ENMN said officials warned it's not easy to trace threatening phone calls. Still, those receiving the calls can take some basic measures in an attempt to apprehend those making the threats, according to FBI Albuquerque Division Media Coordinator Frank Fisher.

Fisher said those receiving a bomb threat should try to do the following:

Remain calm

Keep the caller on the line as long as possible

Write down as much information as you can. This includes the caller ID number, exact wording of threat and type of voice or behavior